diff --git a/lib/libc/posix/pthread.c b/lib/libc/posix/pthread.c
index af2eac8..3aa0c57 100644
--- a/lib/libc/posix/pthread.c
+++ b/lib/libc/posix/pthread.c
@@ -345,18 +345,22 @@ pthread_cond_destroy(pthread_cond_t *cond)
 int
 pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 {
+    int status;
     struct pthread_cond *cnd;
     uint64_t level;
 
     if (*cond == NULL) {
-	int status = pthread_cond_init(cond, NULL);
+	status = pthread_cond_init(cond, NULL);
 	if (status != 0)
 	    return status;
     }
     cnd = *cond;
 
-    if (mutex)
-	pthread_mutex_unlock(mutex);
+    if (mutex) {
+	status = pthread_mutex_unlock(mutex);
+	if (status != 0)
+	    return status;
+    }
 
     CoreMutex_Lock(&cnd->mtx);
     level = cnd->enter;
@@ -367,8 +371,11 @@ pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 	OSThreadSleep(0);
     }
 
-    if (mutex)
-	pthread_mutex_lock(mutex);
+    if (mutex) {
+	status = pthread_mutex_lock(mutex);
+	if (status != 0)
+	    return status;
+    }
 
     return 0;
 }
@@ -377,18 +384,24 @@ int
 pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
 		       const struct timespec *abstime)
 {
+    int status = 0;
+    int rstatus = 0;
     struct pthread_cond *cnd;
     uint64_t level;
+    uint64_t endtime = abstime->tv_sec * 1000000000 + abstime->tv_nsec;
 
     if (*cond == NULL) {
-	int status = pthread_cond_init(cond, NULL);
+	status = pthread_cond_init(cond, NULL);
 	if (status != 0)
 	    return status;
     }
     cnd = *cond;
 
-    if (mutex)
-	pthread_mutex_unlock(mutex);
+    if (mutex) {
+	status = pthread_mutex_unlock(mutex);
+	if (status != 0)
+	    return status;
+    }
 
     CoreMutex_Lock(&cnd->mtx);
     level = cnd->enter;
@@ -398,13 +411,19 @@ pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
     while (level >= cnd->exit) {
 	OSThreadSleep(0);
 
-	// XXX: check time
+	if (endtime < OSTime()) {
+	    rstatus = ETIMEDOUT;
+	    break;
+	}
     }
 
-    if (mutex)
-	pthread_mutex_lock(mutex);
+    if (mutex) {
+	status = pthread_mutex_lock(mutex);
+	if (status != 0)
+	    return status;
+    }
 
-    return 0;
+    return rstatus;
 }